Attachment for talking-machines.



No. 888,306. I PATENTED MAY 19, 1908. W. A. CHAPMAN. ATTACHMENT FOR TALKING MACHINES.

APPLICATION FILED AUG.5,1907.

' ATTORNE rs WILLIAM ALBERT CHAPMAN, OF SMITHVILLE, ARKANSAS.

ATTACHIMENT FOR TALKING-MACHINES.

To all whom it may concern:

Be it known that I, WILLIAM ALBERT CHAPMAN, a citizen of the United States, and aresident of Smithville, in the county of Lawrence and State of Arkansas, have invented a new and Improved Attachment for Talking-Machines, of which the following is a or enablin full, clear, and exact description. A

My invention relates to talking machines and admits of general use, but is of peculiar value in connection with sound reproducers em loyed upon disk talkingmachines.

ong the purposes of my invention are general improvement of the tones, amelioration of the scratching and metallic harshness and'the development of delicate sounds difficult of reproduction.

Reference is to be. had to the accompanying drawings forming a part of this specification, in which similar characters of reference indicate correspondingparts in all the ligures.

Fi ure 1 is a fragmentary side elevation of a dis talking machine equipped with my invention and ready for use; Fig. is an enl'arged rear elevation of the diaphragm box rovided with a needle and with connections the latter to transmit vibrations to the diaphragm; Fig. 3 is a central vertical section through Fig. 2 showing the adjusting screw for controlling the movement of the needle and also showing the means for transmitting vibrations from the needle to the diaphragm; Fig. 4. is a front elevation of the diaphragm box partly broken away; Fig. 5 is anedge view of the diaphragm showing means for adjusting the vibrator which is pivotally mounted upon the diaphragm box; and Fig. 6 is a perspective of the vibrator and its accompanying mechanism for carrying the needle.

A horn is shown at 8 and a turntable at, 9, the latter being mounted upon a revoluble stem 10 and supporting a disk tablet .11. A sleeve 13 is connected with the diaphragm box, 14, the latter having the form of a flat receptacle and being provided with a bottom 15. This bottom is provided with a vent passage 15.

A diaphragm is shown at 16 and at 17 is shown a spring ring. Mounted upon this spring ring are bosses 18 which project into apertures 19 in the diaphragm box 14. The sprin ring 17 is provided with a slot 20 by aid 0 which it may be contracted so as to enter the diaphragm box. Lugs 21 are Specification of Letters Patent.

Application filed August 5, 1907.

Patented May 19, 1908.

Serial No. 387,138.

mounted rigidly upon the diaphragm box and disposed )arallel with each other. A yoke 22, of su stantially U-shape, isjournaled upon the lugs 21 by aid of screws 23, the lattir being conical-pointed and being adjusta le.

A plate 24 is connected with the yoke 22 and 1s provided with a slot 25. A screw 26 extends through a lug 27 threaded to fit it and mounted upon the bottom 15 of the diaphragm box. Spiral springs 28, 29 encircle the screw 26. This screw has a slotted head 30 to receive the point of a screw driver. AI). arm 31 is mounted integrally upon the yoke 22 and is provided with a tap 32 which engages the center of the diaphragm 16. A sleeve 33 is. mounted rigidly upon the plate 24 and is thus rendered integral with the arm 31. The sleeve 33 carries a chuck 34 made in halves, threaded externally, and encircled by a ring 35, the latter being threaded internally. p

A needle is shown at 36 and is inserted within the chuck 34. By turning the ring 35 in one direction the chuck releases its grip upon the needle, whereas by turning the ring 35 in the op osite'directiom the needle is gripped tight y.

A rubber gasket or washer 38 is mounted in the sound box. This'gasket or washer is round in cross section and from one-eighth to three-sixteenths of an inch in diameter, and seated in a groove in the wall of the sound box, said groovebeing preferably of a depth equal to one-third of the diameter of the gasket or washer; Upon this gasket or washer rests the diaphragm 16 and upon said diaphragm rests a second rubber gasket or washer 38 of the same shape and diameter as the gasket or washer 38, but the asket or washer 38 is not let intr. the wail of the sound box; and upon said second gasket or washer rests the spring ring 17. It will thus be seen that through this arrangement the edge of the diaphragm 16 rests on an inwardly sloping surface or seat formed by the first gasket or washer 38, that the second gasket or washer 38 bears on the diaphragm 16 inside, this effecting the putting ofthe diaphragm under a strain or tension, and the s ln'ing ring 17 not only holds the system in p ace, but further exerts a spring pressure on the upper gasket or washer 38. This ressure around the rim or near the edge 0 the diaphragm induces a uniform strain throughout the diaphragm to the increase of its resiii-ency or quickness to respond to any impulse. This I consider a novel and-most iIn-- portantfeature.

My invention is used as follows: The parts being arranged as above described, the operatcr adjusts the tension of the arm 31 against the diaphragm 16 and in doing this makes use of the screw 30, as will be understood from Fig. 3. The needle 36 is now brought into cngagementwith the sound grooves of' the disk tablet 11 and the disk is caused to rotate. Vibrations are communicated from the sound record through the needle ,36,

sleeve 33 and arm 31 to the diaphragm 16- and the sounds are thus re roduced.

From the mountings of t e arm 31 it ,will be noted that this arm has a very simple motion which corres onds to the vibration of the diaphragm. t is im ossible for the arm 31 to have any considera le amount of play and its motion is therefore comparatively true and positive.

in order to remove the diaphragm 16 the dia' hragm box 14 is taken from the machine an the sprin ring 17 pressed inwardly so as to withdraw t e bosses 18 from the apertures 19. The spring ring being taken out the diaphragm and rubber washers can readily be taken out..

It will be noted that the axis of vibration of the arm 31 coincides with the axes of the screws 23, and therefore lies in a plane crossing at a right angle the general longitudinal direction of theneedle 36.

Having thus described my invention, I claim as new and desire to secure by Letters Patent: r 5

1. The combination of, a diaphragm, an

arm for actuating the same, a yoke rigidly,

connected with said arm, aplate connected with said arm and said yoke, said plate bein provided with a slot, apinextending throug said slot, a spring encirclingsaid pin and jengaging said plate ata point adjacent to said slot, a mounting for said; pin, and mechanism connected with 'said arm and provided means for suppprting a needle.

2. The com ination of a dia pose of actuating the same, a yoke rigidly connected with said arm, a 'ivotal support for said yoke, a plate mounte centrally upon hragm a n arm engaging said diaphragmor the pursaid yoke and extending therefrom, as'prin engaging said late, means for adjustingsai spring relative ytosaid plate, and mechanism connected said arm for'suplmlftilig 

